The Periodic Table

Question 1

The period number and

Answer 1

The number of electron shells are the same

Question 2

Why do elements in the same group of the periodic table have Similar chemical properties

Answer 2

Because they have the same number of electrons in their outer shells

Question 3

Noble gases are a family of

Answer 3

Inert gases

Question 4

Why are noble gases generally u reactive

Answer 4

Because they have full outer shells (they don’t loose or gain electrons so do not participate in reactions)

Question 5

Diffusion

Answer 5

The spreading out of particles in a gas or liquid .

They move from a region where they are high concentration to low.

Question 6

Group 1 elements - lithium, sodium and potassium

Answer 6

All these metals react with water to produce a metal hydroxide and hydrogen.
Metal + cold water -> metal hydroxide + hydrogen

Question 7

Sodiums reaction with water

Answer 7

The sodium floats because it is less dense than water.
It melts because it’s melting point is low and a lot of heat is produced by the reaction.
Because the hydrogen isn’t given off symmetrically around the hall, the sodium is passed around the surface of the water.
The white trail is formed in the sodium hydroxide, which dissolved to make a strongly alkaline solution

Question 8

Why are group 1 metals often called alkali metals

Answer 8

Because all these metals react with water to produce alkaline metal hydroxides.

Question 9

The group number

Answer 9

And the number of outer shells are the same